KUALA LUMPUR, Malaysia—Malaysians were met with an unprecedented spectacle over the weekend when the man who ran the country for more than 20 years joined a protest calling for the removal of the current leader.

Mahathir Mohamad, now 90 years old, briefly appeared at a rally in central Kuala Lumpur on Saturday evening and again Sunday afternoon, joining tens of thousands of people who had taken to the streets after it emerged last month that nearly $700 million allegedly passed into the accounts of Prime Minister Najib Razak...

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Malaysians Rally Against Prime Minister Najib Razak

Following Saturday’s protests, crowds returned to the streets of Kuala Lumpur on Sunday to resume their call for Prime Minister Najib Razak to resign over a financial scandal. Video: AP